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<p>[QUOTE=&quot;YOC, post: 2422378, member: 58941&quot;]I&#039;m guessing the sun isn&#039;t part of the equation , but being outside, the coin is in contact with plenty of oxygen and moisture.</p><p><br /></p><p>Source. Gsa </p><p><br /></p><p>Though it does not rust, exposed bronze is subject to oxidation. Copper is the major component of bronze, and it passes through several stages of oxidation in the presence of oxygen and an electrolyte such as rain water. Eventually, the copper in bronze forms a green patina on its surface that prevents further degradation of the underlying metal. Bronze also decays in contact with sulfurous compounds and chlorine, such as those present in sea spray.&nbsp; </p><p>Rub lightly in olive oil and put in an oven on 180 degree c to see what happens. ...[/QUOTE]</p><p><br /></p>

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